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<br />drop structures would be installed at appropriate locations to <br />limit channel velocities and to maintain the bed grade. Channel <br />slopes would be protected with riprap. The Sand Creek channel <br />would consist of four reaches. Pertinent data for the Sand <br />Creek channel improvements are presented in table 12. <br /> <br />Table 12 <br />PERTINENT DATA <br />SAND CREEK CHANNEL IMPROVEMENT <br /> <br /> Reach <br />Item 2B E! 1& 1!i <br />Length in feet 26,400 12,800 5,500 3,100 <br />Bottom width in feet 300 200 150 150 <br />Side slopes 1 on 2 1 on 2 1 on 2 1 on 2 <br />Berm height in feet 0 8 0 8 <br />Berm width in feet 0 34 0 59 <br />Berm slopes o 1 on 50 o 1 on 50 <br />Design depth in feet 12 12 12 10 <br />Low-flow channel capacity <br />in cubic feet per second 52,900 22,000 25,000 16,000 <br />Design discharge in cubic <br />feet per second 52,900 40,000 25,000 24,000 <br />Channel velocity in feet <br />per second 16 16 14 15 <br />Berm velocity in feet <br />per second 0 6 0 4 <br />Riprap <br />Location Slopes Slopes Slopes Slopes <br />Thickness in inches 24 24 24 24 <br />Filter layer in inches 6 6 6 6 <br /> <br /> DROP STRUCTURES <br /> Structure Location ~ Drop in feet <br /> 1 12+00 Straight-drop 10.8 <br /> 2 46+00 Straight-drop 1.6 <br /> 3 66+00 Straight-drop 6.0 <br /> 4 124+00 Straight-drop 1.0 <br /> 5 156+00 Straight-drop 5.0 <br /> 6 246+00 Straight-drop 6.0 <br />~ 7 350+00 Straight-drop 7.0 <br />8 430+00 Straight-drop 5.0 <br />...1 9 470+00 Straight-drop 6.5 <br />r,j) 10 483+00 Straight-drop 6.5 <br /> 11 570+00 Straight-drop 7.0 <br /> 58 <br />